Malicious PDF — malware analysis report

Static analysis result for SHA-256 a741c450951128b9…

MALICIOUS

PDF

90.5 KB Created: 2021-09-03 13:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89eb1f47dd0e3508e39770e0e452d932 SHA-1: 21b3cb39445c3cf452a7ad6981c94c856ef9aeee SHA-256: a741c450951128b901e97ef113412afcc0ec64ee667eb26cc16eedab17359233
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing pages. The presence of 'utm_term' parameters in some URLs further supports the phishing lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=the+willpower+instinct+by+kelly+mcgonigal+free+pdf PDF link annotation
    • http://marasintl.com/public/ckfinderuploads/files/66631048884.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160849dec7eaf5---35421710653.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efe5cbb63c---41275797004.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c523e746698---37317893132.pdfIn PDF document text
    • https://tl-systems.hu/files/files/3934794058.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105548c98f12---43008449480.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210626_19C5F973DFD27F1E.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/foxemirigosugutokowo.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/gaxiluwari.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/bilujerinukimimolevi.pdfIn PDF document text
    • http://grimastone.ru/files/zujamum.pdfIn PDF document text
    • http://brlairport.com/images/file/62285298919.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/wopafejulovax.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c54203c2210---tarojaxodez.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b8799df33291df7d910e972f0565b0af/jewokilekexegolemib.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828b752697---96307447946.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/74306236611.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/poviwotabapu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160eff353b3d5c---rodekize.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89c120e940---11940989069.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/27743712019.pdfIn PDF document text
    • http://apcmagon.com/userfiles/33131262892.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/7c39c984aa2b6892cc95c8177ae704ff/35425167902.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/38f796ccbafd53cd8b06d8cccce6c326/75738421416.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/69921765215.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA65 18152 bytes
SHA-256: e197c4c775c986ef5050b86b28e6353c729a19fbbdadef4b90b60dc81df5c594
font_01_sfnt_off00012976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12976 11460 bytes
SHA-256: 16ee31d3a5693678f5a59209647a95784d9d4c63f9e2a6e30b5555bded34f322
font_02_sfnt_off00014410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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